switch (tagName) {
  case 'XXX':
       case 'THEAD':

    default:
         depth = undefined
       }

     switch ((tagName)) {
  case 'XXX':

    default:
         depth = undefined
       }


switch   ( (tagName) ) {
  case 'XXX':

    default:
         depth = undefined
       }

switch   ((call())) {
  case 'XXX':

     default:
         depth = undefined
       }

    switch   ((a + b).test()) {
    case 'XXX':

        default:
            depth = undefined
        }